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FRASER & GARRETSON.

Patented Dec. 18, 1866,

. St0ve-'-*Pipe Damper.

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STOVE-PIPE DAMPER.

J. FRASER AND 0. s. GARRETSONOF BUFFALO, NFW YORK.

Letters Patent No. 60,498, dated December 18, 1866.

TO ALL WHOM IT MAY CONCERN:

Be it known that we, J. FRAsnR, and O. S. GARnETSON, both of the city of Buffalo, in the State of New York, have invented a new and improved Stove-Pipe Damper and Radiator; and we do hereby declare that the following is a full and .exact description thereof, reference being had to the accompanying drawings, in which- Figure 1 is a longitudinal section of a stove-pipe, giving an edge view of our improved damper.

Figure 2 is a transverse sectionof the stove-pipe, showing the damper in elevation, a portion being broken away.

Figure 3 is a central section of the damper, transversely of its axis, a.

Like letters indicate corresponding parts in all of the figures. M

Our invention has for its object the deflection of the gaseous products of combustion to the periphery of the smoke-pipe, and the absorption of the heat therefrom, .by obstructingand conveying them through sinuous passages, the heat thus absorbed being gradually given off by radiation; and also a mode of construction by which the parts are united without riveting, and can readily be separated and packed in a small compass for shipment. It consists in the combination of two radially grooved concave disks, or valves, resembling the shells of the scallop and other bivalves; and also in connecting them by means of locking-lugs and an axial rod, hereinafter described. Our improved damper is hung upon a spindle or axis Q, passing through the sides of the pipe A, and centrally between the two valves or concave disks B B. These disks are formed to closely resemble the valves of the scallop-shell, having alternate ribs and furrows, commencing at a point on the hinge-side and diverging to the margin. The two disks are arranged together with their hinged portions onopposite sides, as seen most clearly-in fig. 3, so that they are balanced on the axis O, and so also that the furrows s s and-s s will have counter-directions, as seen in fig. 2. Each is provided with a small lip or lug,f orf, projecting from the margin, and also with a corresponding slot in the opposite edge, and both disks being cast from the same pattern, or struck from the same die, by simply reversing their position, the lip of one enters into the corresponding slot of th'e'othcr by a slight lateral movement. The axial rod C is then inserted between them, in notches or recesses formed to receive it, and, fitting closely in these notches, prevents any lateral or other movemeht of one disk upon the other, so that their fastenings cannot be disengaged until the rod is again withdrawn. This holds the parts firmly together, and obviates the necessity of riveting, as heretofore practised indampers composed of several disks or plates. The lugs ff may be made to enter under ahook, or into a slot open at one side, by a. slight turning motion of one valve upon the other, a. modification equivalent in operation and effect to that described. The axial rod is provided with wings, e e, which prevent it from turning without also turning the disks for opening and closing the damper; or it may be made square, flat, or triangular, with the same result. When this damper is closed, it nearly fills the interior diameter of the pipe, leaving a small annular space, g, around it. The hot air and gases, in ascending the pipe, impinge on the convex surface of thedisk, and are deflected to the outside, following the course of the diverging furrows, s s. A portion, however, instead of passing outside of the damper, enters the open space between the valves, and passes through, emerging at the opposite side, as shown by the arrows in fig. 3, travelling twice across the pipe before escaping, by which the greater part of the heat is absorbed, to be given off into the room by radiation again.- The valves are connected eccentrically, to facilitate the passage of heated air through the interior of the damper, as indicated in fig. 2. When open, the damper offers little more-obstruction to the draught than the single-plate damper. The advantages of our invention are: its cheapness of manufacture, being made by casting from two patterns only-one for the two disks, and one for the rod; the facility with which it may be packed for shipping, the disks being alike, and when taken apart fit one into the other its efliciency as a deflector, in directing the heated currentsto the outside, and as an absorbent and radiator, by means-of the large amount of surface presented by the corrugated sides, and the counter-currents produced thereby, in the passage through the interior.

What we claim as our invention, is

1. Connecting the two disks of a pipe-damper together, by means of lugs ff, and corresponding slots or their equivalent, in combination with the axial rod 0, substantially in the mannerand for the purposes set forth.

2. We also claim the two scallop or equivalently formed disks B B, combined to form a pipe-damper, sub- .stantially in the manner and for the purposes set forth.

In witness whereof we have hereunto signed our names in the presence of two subscribing witnesses.

. J. FRASER, Witnesses for J. FRASER: I O. S. GARRETSON. J. S. BROWN, a

Thomas T. PARKER. Witnesses for '0. S. GARRETSONZ JAY Hnrr,

LYMAN P. Pnnxms. 

